CN112486052B - Bogie real-time sensor intelligent detection electrical control system - Google Patents

Bogie real-time sensor intelligent detection electrical control system Download PDF

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Publication number
CN112486052B
CN112486052B CN202011101963.2A CN202011101963A CN112486052B CN 112486052 B CN112486052 B CN 112486052B CN 202011101963 A CN202011101963 A CN 202011101963A CN 112486052 B CN112486052 B CN 112486052B
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pin
capacitor
resistor
chip
relay
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CN112486052A (en
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宁静
贤业飞
康金龙
张立伟
李富强
桑浩然
张春伟
李涪帆
胡广胜
孙福庆
鲍宏
李建辉
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CRRC Qingdao Sifang Co Ltd
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CRRC Qingdao Sifang Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/20—Pc systems
    • G05B2219/25—Pc structure of the system
    • G05B2219/25257—Microcontroller

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)

Abstract

The invention discloses an intelligent detection electric control system of a bogie sensor, which comprises a CPU (central processing unit) main control circuit, a current detection comparison circuit and a current switching circuit, wherein the current detection comparison circuit comprises an isolation amplifier, a first operational amplifier, a second operational amplifier and a comparator. The invention adopts the technical means of loop current detection and active loop control, can detect the current value of the test loop in real time, and cuts off the test loop through the CPU main control circuit when the current value of the test loop reaches a set early warning value, thereby overcoming the problem that the test loop generates large current to burn out a test product due to an accident situation, further achieving the effect of safe and controllable test system, ensuring the safety of the test process of the real-time sensor of the bogie, and improving the test efficiency.

Description

Bogie real-time sensor intelligent detection electrical control system
Technical Field
The invention belongs to the technical field of bogie detection, and particularly relates to an intelligent detection electrical control system for a real-time sensor of a bogie.
Background
The bogie is one of the most important parts on the train, and can amplify the braking force generated by the brake cylinder and enhance the braking effect of the train. Meanwhile, the bogie has good vibration damping characteristic, can alleviate the interaction between the train and the track, reduce the vibration of the train during operation, and improve the train operation stability and safety.
In the production process of the bogie, the real-time sensor index test of the bogie is a tedious and boring work which is very critical. The main test methods at present are the following two types: the first method is manual testing, technicians use standard equipment (a universal meter) to manually measure various parameters of the bogie sensor, and the method needs a large amount of manpower and is very low in testing efficiency; the second method is to use an automated harness tester to achieve fast multi-path testing.
In the two methods, the current control of the test loop only depends on the excitation source protection strategy of the selected instrument, and once the test loop has an accident situation, loop current monitoring and active protection measures are not provided, so that the test product is easily burnt, and certain potential safety hazards exist.
The present invention has been made in view of this situation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an intelligent detection electric control system of a real-time sensor of a bogie.
In order to solve the technical problems, the invention adopts the technical scheme that:
the utility model provides a train bogie real-time sensor intellectual detection system electrical control system, includes CPU master control circuit, current detection comparison circuit and current switching circuit, current detection comparison circuit includes:
an INP pin and an INN pin of the isolation amplifier U7 are connected with two ends of a capacitor C5, a series branch consisting of a resistor R69, a resistor R77 and a resistor R70 is connected with the capacitor C5 in parallel, and a GND2 pin of the isolation amplifier U7 is connected to a reference ground;
a first operational amplifier U9, a non-inverting input terminal of the first operational amplifier U9 is coupled to an OUTP pin of the isolation amplifier U7 through a resistor R71, an inverting input terminal of the first operational amplifier U9 is coupled to an OUTN pin of the isolation amplifier U7 through a resistor R72, an output terminal of the first operational amplifier U9 is coupled to a first terminal of a capacitor C11 through a resistor R75, a first terminal of the capacitor C11 is connected to an AD acquisition port of the CPU main control circuit, and a second terminal of the capacitor C11 is connected to a reference ground;
a second operational amplifier U11, wherein the inverting input terminal of the second operational amplifier U11 is connected with the output terminal, the output terminal of the second operational amplifier is coupled to the non-inverting input terminal of the first operational amplifier U9 through a resistor R73, and the capacitor C6 is connected in parallel with a resistor R73;
an inverting input end of the comparator U15-A is connected to a first end of the capacitor C11, an output end of the comparator U15-A is connected with a first end of the resistor R78, and a second end of the resistor R78 is connected to a first power supply.
Preferably, the current detection comparison circuit further includes a power module U14, a VIN pin of the power module U14 is coupled to a GND pin of the power module U14 through a capacitor C1, the VIN pin of the power module U14 is connected to a second power supply, the GND pin of the power module U14 is connected to a ground reference, a + VO pin of the power module U14 is connected to an anode of an electrolytic capacitor C3, an OV pin of the power module U14 is connected to a cathode of the electrolytic capacitor C3, an anode of the electrolytic capacitor C3 is connected to a VDD1 pin of the isolation amplifier U7, a cathode of the electrolytic capacitor C3 is connected to a GND1 pin of the isolation amplifier U7, and the electrolytic capacitor C3 is connected in parallel with the capacitor C2 and the capacitor C4.
Preferably, the current detection comparison circuit further includes a first voltage reference chip U13, the IN pin of the first voltage reference chip U13 is connected to a third power supply, the IN pin of the first voltage reference chip U13 is coupled to the GND pin of the first voltage reference chip U13 through a capacitor C31, the OUT pin of the first voltage reference chip U13 is coupled to the first end of a capacitor C12 through a resistor R76, the first end of the capacitor C12 is connected to the non-inverting input terminal of the second operational amplifier U11, the second end of the capacitor C12 is connected to a ground reference, and the GND pin of the first voltage reference chip U13 is connected to the ground reference.
Preferably, the inverting input terminal of the first operational amplifier U9 is coupled to the output terminal of the first operational amplifier through a resistor R74, and the resistor R74 is connected in parallel to a capacitor C7.
Preferably, a VDD2 pin of the isolation amplifier U7 is connected to a first terminal of a capacitor C32, the capacitor C32 is connected in parallel with a capacitor C33, a first terminal of the capacitor C32 is connected to a fourth power supply, and a second terminal of the capacitor C32 is connected to a ground reference.
Preferably, the current detection comparison circuit further comprises a second voltage reference chip U2, the IN pin of the second voltage reference chip U2 is connected to the first end of the capacitor C34, the first end of the capacitor C34 is connected to the fifth power supply, the second end of the capacitor C34 is connected to the ground reference, the GND pin of the second voltage reference chip U2 is connected to the ground reference, the OUT pin of the second voltage reference chip U2 is connected to the first end of the capacitor C35, the first end of the capacitor C35 is connected to the non-inverting input terminal of the comparator U15-a, and the second end of the capacitor C35 is connected to the ground reference.
Preferably, the CPU master control circuit includes a processor chip U1, a first crystal oscillator X1, and a second crystal oscillator X2, a pin 23 of the processor chip U1 is connected to an inverting input terminal of a comparator U15-a in the current detection comparison circuit, two ends of the first crystal oscillator X1 are connected to a pin 12 of the processor chip U1 and a pin 13 of the processor chip U1, two ends of the second crystal oscillator X2 are connected to a pin 8 of the processor chip U1 and a pin 9 of the processor chip U1, a series branch composed of a capacitor C24 and a capacitor C25 is connected in parallel with the crystal oscillator X1, a series branch composed of a capacitor C20 and a capacitor C21 is connected in parallel with the crystal oscillator X2, the capacitor C25 is connected to the capacitor C20, and the capacitor C21 is connected to a reference ground.
Preferably, the CPU main control circuit includes a jumper switch SW3, a first end of the jumper switch is connected to a sixth power supply, a second end of the jumper switch is connected to the processor chip U1, and a second end of the jumper switch is coupled to a ground reference through a resistor.
Preferably, the current switching circuit includes an eight-way darlington chip U6, the eight-way darlington chip U6 is connected to the processor chip in the CPU main control circuit, and a pin 8 of the eight-way darlington chip U6 is coupled to the seventh power supply through a resistor RA 7;
a plurality of parallel relay branches are connected between a pin 10 of the eight-way darlington chip U6 and a pin 11 of the eight-way darlington chip U6, each relay branch comprises a relay KA1, a diode DA1, a light emitting diode DAL1, a resistor RA1 and a fuse F4, a pin 4 of the relay KA1 is connected to a pin 9 of the relay KA1, a pin 5 of the relay KA1 and a pin 8 of the relay KA1 are connected to a first end of the fuse F4, a second end of the fuse F4 is connected to an electric connector, a series loop formed by the light emitting diode DAL1 and the resistor RA1 is connected in parallel with the diode DA1 to a pin 1 of the relay KA1 and a pin 12 of the relay KA1, and a pin 1 of the relay KA1 is connected to an eighth power supply.
Preferably, the current switching circuit further includes a relay KA8, a diode DA8, a light emitting diode DAL8 and a resistor RA8, a pin 4 of the relay KA8 is connected to a pin 9 of the relay KA8, a pin 5 of the relay KA8 and a pin 8 of the relay KA8 are connected to the electrical connector, a series circuit formed by the light emitting diode DAL8 and the resistor RA8 is connected in parallel with the diode DA8 to a pin 1 of the relay KA8 and a pin 12 of the relay KA8, a pin 1 of the relay KA8 is connected to a pin 10 of the octuple darlington chip U6, and a pin 12 of the relay KA8 is connected to a pin 11 of the octuple darlington chip U6.
After adopting the technical scheme, compared with the prior art, the invention has the following beneficial effects:
the invention adopts the technical means of loop current detection and active loop control, can detect the current value of the test loop in real time, and cuts off the test loop through the CPU main control circuit when the current value of the test loop reaches a set early warning value, thereby overcoming the problem that the test loop generates large current to burn out a test product due to an accident situation, further achieving the effect of safe and controllable test system, ensuring the safety of the test process of the real-time sensor of the bogie, and improving the test efficiency.
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the right. It is obvious that the drawings in the following description are only some embodiments, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
FIG. 1 is a flow chart of the bogie real-time sensor intelligent detection control system of the present invention;
FIG. 2 is an electrical schematic of the CPU master control circuit of the present invention;
FIG. 3 is an electrical schematic of the Ethernet PHY circuit of the present invention;
FIG. 4 is an electrical schematic of the current sensing comparator circuit of the present invention;
FIG. 5 is an electrical schematic of the power circuit of the present invention;
fig. 6 is an electrical schematic of the current switching circuit of the present invention.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used for illustrating the present invention and are not intended to limit the scope of the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, an embodiment of the present invention provides an intelligent detection electrical control system for a real-time sensor of a bogie, including a CPU main control circuit, a current detection comparison circuit, and a current switching circuit. When measuring the loop resistance, the peripheral standard tester outputs an excitation voltage signal, and the signal firstly passes through the current detection comparison circuit and then is output to the tested sensor through the current switching circuit to measure the resistance value. In the measuring process, the current detection comparison circuit collects the current value of the test loop in real time and transmits the current value to the CPU main control circuit in real time, the CPU main control circuit controls the on-off of the loop according to a judgment threshold preset by a user, and if the current value collected by the current detection comparison circuit reaches a preset threshold value, the test loop is disconnected and an alarm signal is given, so that the problem that the test loop generates a large-current burning test product due to an accident condition is solved, and the safe and controllable effect of the test system is achieved.
In one embodiment of the invention, the device comprises a CPU main control circuit, an Ethernet PHY circuit, a current detection comparison circuit, a power supply circuit and a current switching circuit.
As shown in fig. 2, the CPU master control circuit in the embodiment of the present invention includes an STM32F207 processor chip U1, a first crystal oscillator X1, a second crystal oscillator X2, a three-primary-color LED lamp L4, and a jumper switch SW 3. Pin 6, pin 11, pin 19, pin 28, pin 50, pin 75, pin 100, pin 22 of the STM32F207 processor chip U1 are all connected with a first end of a resistor R17 and are connected with a +3.3V power supply, and pin 21 of the STM32F207 processor chip U1 is connected with a second end of a resistor R17. Pin 73 of STM32F207 processor chip U1 is coupled to ground reference via capacitor C22, and pin 49 of STM32F207 processor chip U1 is coupled to ground reference via capacitor C23. The pin 46 of the STM32F207 processor chip U1 is connected to the first terminal of a resistor R23, the first terminal of a capacitor C8 and the first terminal of a SW1-B switch, the second terminal of the SW1-B switch is connected to the second terminal of a capacitor C8 and grounded, and the second terminal of the resistor R23 is connected to a +3.3V power supply.
The pins 55, 56, 57, 58, 59, 60, 61, 62 of the STM32F207 processor chip U1 are respectively connected to the first end of a resistor R29, the first end of a resistor R31, the first end of a resistor R32, the first end of a resistor R33, the first end of a resistor R34, the first end of a resistor R36, the first end of a resistor R37, the first end of a resistor R38, and the pin 16, 15, 14, 13, 12, 11, 10, 9 of a jumper switch SW3, pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7 and pin 8 of jumper switch SW3 are all connected with a +3.3V power supply, the second end of the resistor R29, the second end of the resistor R31, the second end of the resistor R32, the second end of the resistor R33, the second end of the resistor R34, the second end of the resistor R36, the second end of the resistor R37 and the second end of the resistor R38 are all grounded.
Pin 67 of the STM32F207 processor chip U1 is connected to a first terminal of a resistor R214, and a second terminal of the resistor R214 is connected to pin 24 of the STM32F207 processor chip U1. Pin 68 and pin 69 of the STM32F207 processor chip U1 are respectively connected to pin 2 and pin 3 of the electrical connector J10, pin 1 of the electrical connector J10 is connected to the +3.3V power supply, and pin 4 of the electrical connector J10 is connected to ground.
The pin 70 and the pin 71 of the STM32F207 processor chip U1 are respectively connected with the first end of a resistor R18 and the first end of a resistor R19, and the second end of the resistor R18 and the second end of the resistor R19 are respectively connected with the pin 6 and the pin 4 of the three-primary-color LED lamp. The pin 1, the pin 3 and the pin 5 of the three-primary-color LED lamp L4 are connected with a +3.3V power supply and a first end of a capacitor C26, a first end of a capacitor C27, a first end of a capacitor C28, a first end of the capacitor C29 and the anode of an electrolytic capacitor C30, a second end of a capacitor C26, a second end of a capacitor C27, a second end of the capacitor C28, a second end of a capacitor C29 and the cathode of the electrolytic capacitor C30 are all grounded, a pin 2 of the three-primary-color LED lamp L4 is connected with a first end of a resistor R11, and a second end of a resistor R11 is grounded.
Pin 72, pin 76, pin 77, pin 90 and pin 89 of the STM32F207 processor chip U1 are respectively connected with pin 2, pin 3, pin 4, pin 5 and pin 6 of the electrical connector J11, pin 1 of the electrical connector is connected with a +3.3V power supply, and pin 7 of the electrical connector is grounded.
Pin 8 of the STM32F207 processor chip U1 is connected to a first terminal of a capacitor C21 and a first terminal of a second crystal oscillator X2, and pin 9 of the STM32F207 processor chip U1 is connected to a first terminal of a capacitor C20 and a second terminal of a second crystal oscillator X2. Pin 13 of STM32F207 processor chip U1 is connected to a first terminal of capacitor C25 and a first terminal of first crystal oscillator X1, and pin 12 of STM32F207 processor chip U1 is connected to a second terminal of first crystal oscillator X1 and a first terminal of capacitor C24. The second terminal of the capacitor C20, the second terminal of the capacitor C21, the second terminal of the capacitor C24, the second terminal of the capacitor C25, and pin 10, pin 20, pin 27, and pin 74 of the STM32F207 processor chip U1 are all grounded.
Pin 37 of the STM32F207 processor chip U1 is connected to a first terminal of a resistor R20, a second terminal of the resistor R20 is connected to ground, and pin 99 of the STM32F207 processor chip U1 is connected to ground. The pin 94 of the STM32F207 processor chip U1 is connected to the first terminal of a resistor R27 and pin 2 of an electrical connector J12, the second terminal of the resistor R27 is grounded, and pin 1 of the electrical connector J12 is connected to a +3.3V power supply.
Pin 14 of the STM32F207 processor chip U1 pins a first terminal of a resistor R16, a first terminal of a capacitor C19, and a first terminal of a SW1-A switch; a second terminal of the SW1-A switch and a second terminal of the capacitor C19 are connected and grounded; the second end of the resistor R16 is connected to the +3.3V power supply.
Pins 38, 39, 40, 41, 42, 43 of the STM32F207 processor chip U1 are connected to current switching circuitry. Pin 25, pin 32, pin 33, pin 34, pin 47, pin 48, pin 51, pin 52 of STM32F207 processor chip U1 are connected to the ethernet PHY circuitry. Pin 23, pin 91 of STM32F207 processor chip U1 are connected to a current sense compare circuit.
As shown in fig. 3, the ethernet PHY circuit in the embodiment of the present invention electrically includes a DP83848VYB control chip U17. The pin 2, the pin 3, the pin 4, the pin 5 and the pin 6 of the DP83848VYB control chip U17 are respectively connected to the first end of the resistor R216, the first end of the resistor R217, the first end of the resistor R218, the first end of the resistor R219 and the first end of the resistor R220, the second end of the resistor R219 and the second end of the resistor R220 are grounded, and the second end of the resistor R216, the second end of the resistor R217 and the second end of the resistor R218 are connected to the pin 48, the pin 51 and the pin 52 of the STM32F207 processor chip U1 in the CPU main control circuit.
The pin 41, the pin 42 and the pin 43 of the DP83848VYB control chip U17 are respectively connected with the first end of a resistor R222, the first end of a resistor R223 and the first end of a resistor R224, and the second end of the resistor R222, the second end of the resistor R223 and the second end of the resistor R224 are respectively connected with the pin 47, the pin 33 and the pin 34 of an STM32F207 processor chip U1 in a CPU main control circuit.
The pin 39 of the DP83848VYB control chip U17 is connected with the first end of a resistor R221, the second end of the resistor R221 is connected with the first end of a resistor R24 and the first end of a resistor R267, the second end of the resistor R24 is connected with a +3.3V power supply, and the second end of the resistor R267 is connected with the pin 32 of an STM32F207 processor chip U1 in a CPU main control circuit.
The pin 42 of the DP83848VYB control chip U17 is connected with the first end of the resistor R117, the pin 40 of the DP83848VYB control chip U17 is connected with the first end of the resistor R225, the second end of the resistor R225 is connected with the first end of the resistor R28 and the first end of the resistor R266, the second end of the resistor R117 and the second end of the resistor R28 are both connected with a +3.3V power supply, and the second end of the resistor R226 is connected with the second end of the resistor R267.
The pin 30 of the DP83848VYB control chip U17 is connected with the first end of the resistor 215 and the pin 25 of the STM32F207 processor chip U1 in the CPU main control circuit, and the second end of the resistor 215 is connected with a +3.3V power supply. Pin 7 of the DP83848VYB control chip U17 is connected with the first end of a resistor R206, and the second end of the resistor 206 is connected with a +3.3V power supply. The pin 24 of the DP83848VYB control chip U17 is connected to the first terminal of the resistor R207, and the second terminal of the resistor R207 is connected to ground.
Pin 34 of the DP83848VYB control chip U17 is connected to pin 67 of the STM32F207ARM processor chip U1 in the CPU master control circuit. The pin 18, the pin 37 and the pin 23 of the DP83848VYB control chip U17 are all connected to a first end of a parallel branch consisting of a capacitor C9, a capacitor C186, a capacitor C187 and a capacitor C86, and a second end of the parallel branch consisting of the capacitor C9, the capacitor C186, the capacitor C187 and the capacitor C86 is grounded.
The pin 20 and the pin 21 of the DP83848VYB control chip U17 are respectively connected with the first end of a resistor R118 and the first end of a resistor R119, and the second end of the resistor R118 and the second end of the resistor R119 are respectively connected with a +3.3V power supply. The pin 47, the pin 36, the pin 35, the pin 19 and the pin 15 of the DP83848VYB control chip U17 are connected to the first end of the capacitor C191 and grounded, the pin 48, the pin 32 and the pin 22 of the DP83848VYB control chip U17 are connected to the second end of the capacitor C191, the second end of the capacitor C191 is connected to the +3.3V power supply, the first end of the resistor R213 and the first end of the resistor R212, the capacitor C190 and the capacitor C88 are connected to the capacitor C191 in parallel, and the second end of the resistor R213 and the second end of the resistor R212 are respectively connected to the pin 9 and the pin 12 of the connector J1.
The pin 26, the pin 27 and the pin 28 of the DP83848VYB control chip U17 are respectively connected to the first end of the resistor R120, the first end of the resistor R121 and the first end of the resistor R122, the second end of the resistor R120, the second end of the resistor R121 and the second end of the resistor R122 are respectively connected to a +3.3V power supply, and the pin 26 and the pin 28 of the DP83848VYB control chip U17 are respectively connected to the pin 10 and the pin 11 of the connector J1.
Pins 13, 14, 16 and 17 of a DP83848VYB control chip U17 are respectively connected with a first end of a resistor R211, a first end of a resistor R210, a first end of a resistor R209, a first end of a resistor R208, a second end of the resistor R211, a second end of the resistor R210, a second end of the resistor R209 and a second end of the resistor R208 are respectively connected with a +3.3V power supply. The first terminal of the capacitor C188 is connected with the second terminal of the resistor R208, the second terminal of the capacitor C188 is grounded, and the capacitor C189 is connected with the capacitor C188 in parallel. Pins 13, 14, 16 and 17 of a DP83848VYB control chip U17 are respectively connected with pins 6, 3, 2 and 1 of an electric connector J1, and pins 4 and 5 of an electric connector J1 are connected with a +3.3V power supply.
As shown in FIG. 4, the current detection comparing circuit in the embodiment of the present invention includes an AMC1302 isolation amplifier U7, a first operational amplifier U9, a second operational amplifier U11, a comparator U15-A, a power supply module U14, a first voltage reference chip U13, and a second voltage reference chip U2.
An INP pin and an INN pin of an AMC1302 isolation amplifier U7 are connected with two ends of a capacitor C5, a series branch consisting of a resistor R69, a resistor R77 and a resistor R70 is connected with a capacitor C5 in parallel, a GND2 pin of an AMC1302 isolation amplifier U7 is connected to a reference ground, and the resistor R77 is connected to a current switching circuit. The VDD2 pin of AMC1302 isolation amplifier U7 is connected to a first terminal of a capacitor C32, a first terminal of a capacitor C32 is connected to a +3.3V power supply, a capacitor C32 is connected in parallel with a capacitor C33, and a second terminal of a capacitor C32 is connected to ground. AMC1302 isolates the GND2 pin of amplifier U7 to ground.
The VIN pin of the power module U14 is coupled to the GND pin of the power module U14 through a capacitor C1, the VIN pin of the power module U14 is connected to a +24V power supply, and the GND pin of the power module U14 is grounded. The + VO pin of the power supply module U14 is connected to the positive pole of an electrolytic capacitor C3, the OV pin of the power supply module U14 is connected to the negative pole of an electrolytic capacitor C3, the positive pole of the electrolytic capacitor C3 is connected to the VDD1 pin of an AMC1302 isolation amplifier U7, the negative pole of the electrolytic capacitor C3 is connected to the GND1 pin of the AMC1302 isolation amplifier U7, and the electrolytic capacitor C3 is connected in parallel with a capacitor C2 and a capacitor C4.
The non-inverting input of the first operational amplifier U9 is coupled to the OUTP pin of the AMC1302 isolation amplifier U7 through a resistor R71, and the inverting input of the first operational amplifier U9 is coupled to the OUTN pin of the AMC1302 isolation amplifier U7 through a resistor R72. The output terminal of the first operational amplifier U9 is coupled to the first terminal of the capacitor C11 through the resistor R75, the first terminal of the capacitor C11 is connected to the pin 23 of the STM32F207 processor chip U1 of the CPU master control circuit, and the second terminal of the capacitor C11 is grounded. The inverting input terminal of the first operational amplifier U9 is coupled to the output terminal of the first operational amplifier through a resistor R74, and the resistor R74 is connected in parallel with the capacitor C7.
The inverting input terminal of the second operational amplifier U11 is connected to the output terminal of the second operational amplifier U11, the output terminal of the second operational amplifier is coupled to the non-inverting input terminal of the first operational amplifier U9 through a resistor R73, and the capacitor C6 is connected in parallel with the resistor R73.
The IN pin of the first voltage reference chip U13 is connected to a +5V power supply, the IN pin of the first voltage reference chip U13 is coupled to the GND pin of the first voltage reference chip U13 through a capacitor C31, and the GND pin of the first voltage reference chip U13 is connected to a ground reference. The OUT pin of the first voltage reference chip U13 is coupled to the first terminal of the capacitor C12 through the resistor R76, the first terminal of the capacitor C12 is connected to the non-inverting input terminal of the second operational amplifier U11, and the second terminal of the capacitor C12 is connected to the ground reference.
The inverting input end of the comparator U15-A is connected to the first end of the capacitor C11, the output end of the comparator U15-A is connected with the first end of the resistor R78, the second end of the resistor R78 is connected to the first power supply, and the output end of the comparator U15-A is connected to the current switching circuit.
The IN pin of the second voltage reference chip U2 is connected to the first terminal of the capacitor C34 and the +5V power supply, and the second terminal of the capacitor C34 is connected to the ground reference. The GND pin of the second voltage reference chip U2 is connected to a reference ground, the OUT pin of the second voltage reference chip U2 is connected to a first terminal of a capacitor C35, a first terminal of a capacitor C35 is connected to a non-inverting input terminal of a comparator U15-A, and a second terminal of a capacitor C35 is connected to the reference ground.
As shown in FIG. 5, the power circuit of the embodiment of the invention includes LM257655-5.0 voltage regulation chip U4 and AMS1117-3.3 chip U5. The pin 1 of the LM25765S-5.0 voltage-stabilizing chip U4 is connected with the anode of an electrolytic capacitor C15, the pin 5 of the LM25765S-5.0 voltage-stabilizing chip U4 is connected with the cathode of an electrolytic capacitor C15, the anode of an electrolytic capacitor C15 is connected with a +24V power supply, and the cathode of an electrolytic capacitor C15 is grounded. The capacitor C14 is connected in parallel with the electrolytic capacitor C15, the cathode of the diode D68 is connected with the anode of the electrolytic capacitor C15, and the anode of the diode D68 is connected with the cathode of the electrolytic capacitor C15. The anode of the diode D49 is connected with the cathode of the electrolytic capacitor C15, the cathode of the diode D49 is connected with the pin 2 of the electric connector J9, the pin 1 of the electric connector J9 is connected with the anode of the diode D65, the cathode of the diode D65 is connected with the first end of the fuse F33, and the second end of the fuse F33 is connected with the anode of the electrolytic capacitor C15.
The pin 2 of the LM25765S-5.0 voltage-stabilizing chip U4 is connected with the cathode of the diode D66 and the first end of the inductor L2, the second end of the inductor L2 is connected with the anode of the electrolytic capacitor C16 and the pin 4 of the LM25765S-5.0 voltage-stabilizing chip U4, the anode of the electrolytic capacitor C16 is connected with the pin 3 and +5V power supply of the AMS1117-3.3 chip U5, the pin 6 of the LM25765S-5.0 voltage-stabilizing chip U4, the anode of the diode D66 and the cathode of the electrolytic capacitor C16 are all grounded, and the capacitor C13 is connected with the electrolytic capacitor C16 in parallel.
The pin 2 and the pin 4 of the AMS1117-3.3 chip U5 are connected with the anode of an electrolytic capacitor C18 and a +3.3V power supply, the cathode grounding capacitor C17 of the electrolytic capacitor C18 is connected with the electrolytic capacitor C18 in parallel, and the pin 1 of the AMS1117-3.3 chip U5 is grounded.
As shown in fig. 6, the current switching circuit in the embodiment of the present invention includes an eight-way darlington chip U6, and pin 1, pin 2, pin 3, pin 4, pin 5, and pin 6 of the eight-way darlington chip U6 are respectively connected to pin 38, pin 39, pin 40, pin 41, pin 42, and pin 43 of the STM32F207 processor chip U1 in the CPU main control circuit. Pin 1, pin 2, pin 3, pin 4, pin 5, and pin 6 of the eight-circuit darlington chip U6 are respectively connected to a first end of a resistor R1, a first end of a resistor R2, a first end of a resistor R3, a first end of a resistor R4, a first end of a resistor R5, and a first end of a resistor R6; the second end of the resistor R1, the second end of the resistor R2, the second end of the resistor R3, the second end of the resistor R4, the second end of the resistor R5 and the second end of the resistor R6 are all grounded.
Pin 8 of the eight-circuit Darlington chip U6 is connected with the first end of a resistor RA7, the anode of a diode DA7 and the anode of a diode DA9, the second end of the resistor RA7 is connected with a +3.3V power supply, and the cathode of the diode DA7 is connected with the output end of a comparator U15-A in the current detection comparison circuit. Pin 11 of the octuple darlington chip U6 is connected to pin 18, pin 17, pin 16, pin 15, pin 14, and pin 13 of the octuple darlington chip U6. A plurality of parallel relay branches are connected between a pin 10 of the eight-path Darlington chip U6 and a pin 11 of the eight-path Darlington chip U6, and the pin 10 of the eight-path Darlington chip U6 is connected with a +24V power supply.
The first relay branch comprises a relay KA1, a diode DA1, a light emitting diode DAL1, a resistor RA1 and a fuse F4. Pin 4 of the relay KA1 and pin 9 of the relay KA1 are connected to a first end of a resistor R77 in the current detection comparison circuit, pin 5 of the relay KA1 and pin 8 of the relay KA1 are connected to a first end of a fuse F4, and a second end of the fuse F4 is connected to pin 4 of an electrical connector J2. The anode of the light emitting diode DAL1 is connected with the first end of the resistor RA1, the cathode of the light emitting diode DAL1 is connected with the anode of the diode DA1, the second end of the resistor RA1 is connected with the cathode of the diode DA1, the anode of the diode DA1 is connected with the pin 12 of the relay KA1 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA1 is connected with the pin 1 of the relay KA1 and the pin 10 of the octuple Darlington chip.
The second relay branch comprises a relay KA2, a diode DA2, a light emitting diode DAL2, a resistor RA2 and a fuse F3. Pin 4 of the relay KA2 and pin 9 of the relay KA2 are connected to a first end of a resistor R77 in the current detection comparison circuit, pin 5 of the relay KA2 and pin 8 of the relay KA2 are connected to a first end of a fuse F3, and a second end of the fuse F3 is connected to pin 3 of an electrical connector J2. The anode of the light emitting diode DAL2 is connected with the first end of the resistor RA2, the cathode of the light emitting diode DAL2 is connected with the anode of the diode DA2, the second end of the resistor RA2 is connected with the cathode of the diode DA2, the anode of the diode DA2 is connected with the pin 12 of the relay KA2 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA2 is connected with the pin 2 of the relay and the pin 10 of the octuple Darlington chip.
The third relay branch comprises a relay KA3, a diode DA3, a light emitting diode DAL3, a resistor RA3 and a fuse F2. Pin 4 of the relay KA3 and pin 9 of the relay KA3 are connected to a first end of a resistor R77 in the current detection comparison circuit, pin 5 of the relay KA3 and pin 8 of the relay KA3 are connected to a first end of a fuse F2, and a second end of the fuse F2 is connected to pin 2 of an electrical connector J2. The anode of the light emitting diode DAL3 is connected with the first end of the resistor RA3, the cathode of the light emitting diode DAL3 is connected with the anode of the diode DA3, the second end of the resistor RA3 is connected with the cathode of the diode DA3, the anode of the diode DA3 is connected with the pin 12 of the relay KA3 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA3 is connected with the pin 1 of the relay KA3 and the pin 10 of the octuple Darlington chip.
The fourth relay branch comprises a relay KA4, a diode DA4, a light emitting diode DAL4, a resistor RA4 and a fuse F1. Pin 4 of the relay KA4 and pin 9 of the relay KA4 are connected to a first end of a resistor R77 in the current detection comparison circuit, pin 5 of the relay KA4 and pin 8 of the relay KA4 are connected to a first end of a fuse F1, and a second end of the fuse F1 is connected to pin 1 of an electrical connector J2. The anode of the light emitting diode DAL4 is connected with the first end of the resistor RA4, the cathode of the light emitting diode DAL4 is connected with the anode of the diode DA4, the second end of the resistor RA4 is connected with the cathode of the diode DA4, the anode of the diode DA4 is connected with the pin 12 of the relay KA4 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA4 is connected with the pin 1 of the relay KA4 and the pin 10 of the octuple Darlington chip.
The fifth relay branch comprises a relay KA5, a diode DA5, a light emitting diode DAL5, a resistor RA5 and a fuse F5. Pin 4 of the relay KA5 and pin 9 of the relay KA5 are connected to a first end of a resistor R77 in the current detection comparison circuit, pin 5 of the relay KA5 and pin 8 of the relay KA5 are connected to a first end of a fuse F5, and a second end of the fuse F5 is connected to pin 5 of an electrical connector J2. The anode of the light emitting diode DAL5 is connected with the first end of the resistor RA5, the cathode of the light emitting diode DAL5 is connected with the anode of the diode DA5, the second end of the resistor RA5 is connected with the cathode of the diode DA5, the anode of the diode DA5 is connected with the pin 12 of the relay KA5 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA5 is connected with the pin 1 of the relay KA5 and the pin 10 of the octuple Darlington chip.
The sixth relay branch comprises a relay KA6, a diode DA6, a light emitting diode DAL6, a resistor RA6 and a fuse F6. Pin 4 of the relay KA6 and pin 9 of the relay KA6 are connected to a first end of a resistor R77 in the current detection comparison circuit, pin 5 of the relay KA6 and pin 8 of the relay KA6 are connected to a first end of a fuse F6, and a second end of the fuse F6 is connected to pin 6 of an electrical connector J2. The anode of the light emitting diode DAL6 is connected with the first end of the resistor RA6, the cathode of the light emitting diode DAL6 is connected with the anode of the diode DA6, the second end of the resistor RA6 is connected with the cathode of the diode DA6, the anode of the diode DA6 is connected with the pin 12 of the relay KA6 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA6 is connected with the pin 1 of the relay KA6 and the pin 10 of the octuple Darlington chip.
The seventh relay branch comprises a relay KA8, a diode DA8, a light emitting diode DAL8 and a resistor RA 8. Pin 4 of the relay KA8 and pin 9 of the relay KA8 are connected to the second end of a resistor R77 in the current detection comparison circuit, and pin 5 of the relay KA8 and pin 8 of the relay KA8 are connected to pin 8 of an electrical connector J2. The anode of the light emitting diode DAL8 is connected with the first end of the resistor RA8, the cathode of the light emitting diode DAL8 is connected with the anode of the diode DA8, the second end of the resistor RA8 is connected with the cathode of the diode DA8, the anode of the diode DA8 is connected with the pin 12 of the relay KA6 and the pin 11 of the octuple Darlington chip, and the cathode of the diode DA6 is connected with the pin 1 of the relay KA6 and the pin 10 of the octuple Darlington chip.
When measuring loop resistance, the peripheral standard test instrument outputs an excitation voltage signal, and the signal firstly passes through the current detection comparison circuit and then is output to the tested sensor through the current switching circuit to measure the resistance value. In the measuring process, the current detection comparison circuit collects the current value of the test loop in real time and transmits the current value to the CPU main control circuit in real time, the CPU main control circuit controls the on-off of the loop according to a judgment threshold set in advance by a user, and if the current value reaches the set threshold, the test loop is disconnected and an alarm signal is given.
The current detection comparison circuit adopts an AMC1302 isolation amplifier with +/-50 mV input voltage of TI company, and the chip has the characteristics of high isolation, low offset error, temperature drift, fixed gain and the like, is very suitable for measuring weak current signals, and cannot influence the measurement signals. The current signals adjusted by the AMC1302 isolation amplifier are simultaneously collected by the comparator and an AD collection module of the CPU main control circuit. The comparator can set a hardware stop value for the current signal, the value can not be set and can not be changed after production, so that the situation that the control circuit can not be disconnected after the CPU main control circuit is mistakenly collected is prevented. The AD acquisition module of the CPU main control circuit can flexibly set the current value of the disconnection control circuit through the software of the upper computer, if the acquired current value is higher than the set current value, the test circuit is disconnected and information is uploaded to the upper computer, the upper computer is informed of the channel number and the current value, and then the channel can be judged to have problems.
The CPU main control circuit adopts an STM32F207 chip U1, has an Ethernet port and a large number of IO resources, and can conveniently expand functions. The frequency of the ARM 32-bitCortex-M4 processor chip is up to 168MHz, and the processor chip is provided with storage interfaces such as 1Mbyte Flash, 192Kbyte SRAM, expandable external Flash, SRAM and the like, 3 ADC interfaces of 12-bit 2.4MSPS, 3I 2C interfaces, 4 USART interfaces, 3 SPI interfaces, 2 CAN interfaces, USB2.0 and 10/100Ethernet MAC and the like. The CPU main control circuit operates under 168MHz and collects the current value in real time, so the current value abnormity can be found rapidly and is within 100nS, and the test product can be well protected.
The above embodiments are only preferred embodiments of the present invention, and not intended to limit the present invention in any way, and although the present invention has been disclosed by the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make various changes and modifications to the equivalent embodiments by using the technical contents disclosed above without departing from the technical scope of the present invention, and the embodiments in the above embodiments can be further combined or replaced, but any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims (10)

1. The utility model provides a train bogie real-time sensor intellectual detection system electrical control system, includes CPU master control circuit, current detection comparison circuit and current switching circuit, its characterized in that, through the current value of return circuit current detection and active loop control real-time detection test circuit, when the current value of test circuit reaches the early warning value of settlement, cuts off test circuit through CPU master control circuit, current detection comparison circuit includes:
an isolation amplifier U7, an INP pin and an INN pin of the isolation amplifier U7 are connected with two ends of a capacitor C5, a series branch consisting of a resistor R69, a resistor R77 and a resistor R70 is connected with the capacitor C5 in parallel, a GND2 pin of the isolation amplifier U7 is connected to a reference ground, and the resistor R77 is connected to the current switching circuit;
a first operational amplifier U9, a non-inverting input terminal of the first operational amplifier U9 is coupled to the OUTP pin of the isolation amplifier U7 through a resistor R71, an inverting input terminal of the first operational amplifier U9 is coupled to the OUTN pin of the isolation amplifier U7 through a resistor R72, an output terminal of the first operational amplifier U9 is coupled to a first terminal of a capacitor C11 through a resistor R75, and a second terminal of the capacitor C11 is connected to the ground reference;
a second operational amplifier U11, an inverting input terminal of the second operational amplifier U11 is connected with an output terminal, the output terminal of the second operational amplifier is coupled to a non-inverting input terminal of the first operational amplifier U9 through a resistor R73, and a capacitor C6 is connected in parallel with a resistor R73;
the inverting input end of the comparator U15-A is connected to the first end of the capacitor C11, the first end of the capacitor C11 is connected to the AD acquisition port of the CPU main control circuit, the output end of the comparator U15-A is connected with the first end of a resistor R78, the resistor R78 is connected to the CPU main control circuit, and the second end of the resistor R78 is connected to the first power supply.
2. The train bogie real-time sensor intelligent detection electrical control system as claimed in claim 1, wherein the current detection comparison circuit further comprises a power module U14, a VIN pin of the power module U14 is coupled to a GND pin of the power module U14 through a capacitor C1, the VIN pin of the power module U14 is connected to a second power supply, the GND pin of the power module U14 is connected to a ground reference, a + VO pin of the power module U14 is connected to an anode of an electrolytic capacitor C3, a 0V pin of the power module U14 is connected to a cathode of an electrolytic capacitor C3, the anode of the electrolytic capacitor C3 is connected to a VDD1 pin of the isolation amplifier U7, the cathode of the electrolytic capacitor C3 is connected to a GND1 pin of the isolation amplifier U7, and the electrolytic capacitor C3 is connected in parallel with the capacitor C2 and the capacitor C4.
3. The train bogie real-time sensor intelligent detection electric control system as claimed IN claim 2, wherein the current detection comparison circuit further comprises a first voltage reference chip U13, the IN pin of the first voltage reference chip U13 is connected to a third power supply, the IN pin of the first voltage reference chip U13 is coupled to the GND pin of the first voltage reference chip U13 through a capacitor C31, the OUT pin of the first voltage reference chip U13 is coupled to the first end of a capacitor C12 through a resistor R76, the first end of the capacitor C12 is connected to the non-inverting input end of the second operational amplifier U11, the second end of the capacitor C12 is connected to a reference ground, and the GND pin of the first voltage reference chip U13 is connected to the reference ground.
4. The train bogie real-time sensor intelligent detection electric control system as claimed IN claim 3, wherein the current detection comparison circuit further comprises a second voltage reference chip U2, the IN pin of the second voltage reference chip U2 is connected to the first end of a capacitor C34, the first end of the capacitor C34 is connected to a fifth power supply, the second end of the capacitor C34 is connected to a ground reference, the GND pin of the second voltage reference chip U2 is connected to the ground reference, the OUT pin of the second voltage reference chip U2 is connected to the first end of a capacitor C35, the first end of the capacitor C35 is connected to the non-inverting input end of the comparator U15-A, and the second end of the capacitor C35 is connected to the ground reference.
5. The electrical control system for real-time sensor intelligent detection of train bogie according to any one of claims 1-4, wherein the inverting input terminal of the first operational amplifier U9 is coupled to the output terminal of the first operational amplifier via a resistor R74, and the resistor R74 is connected in parallel with the capacitor C7.
6. The train bogie real-time sensor smart detection electrical control system as recited in claim 5, wherein a VDD2 pin of the isolation amplifier U7 is connected to a first end of a capacitor C32, the capacitor C32 is connected in parallel with a capacitor C33, a first end of the capacitor C32 is connected to a fourth power supply, and a second end of the capacitor C32 is connected to a ground reference.
7. The train bogie real-time sensor intelligent detection electric control system as claimed in claim 1, 2, 3, 4 or 6, wherein the CPU master control circuit comprises a processor chip U1, a first crystal oscillator X1 and a second crystal oscillator X2, a pin 23 of the processor chip U1 is connected to an inverting input terminal of a comparator U15-A in the current detection comparison circuit, two ends of the first crystal oscillator X1 are connected with a pin 12 of the processor chip U1 and a pin 13 of the processor chip U1, two ends of the second crystal oscillator X2 are connected with a pin 8 of the processor chip U1 and a pin 9 of the processor chip U1, a series branch consisting of a capacitor C24 and a capacitor C25 is connected in parallel with the crystal oscillator X1, a series branch consisting of a capacitor C20 and a capacitor C21 is connected in parallel with the crystal oscillator X2, the capacitor C25 is connected with the capacitor C20, the capacitor C21 is connected to the ground reference, the pin 23 of the processor chip U1 is connected to the first end of the capacitor C11 in the current detection comparison circuit, and the pin 91 of the processor chip U1 is connected to the output end of the comparator U15-A in the current detection comparison circuit.
8. The electrical control system according to claim 7, wherein the CPU main control circuit comprises a jumper switch SW3, a first end of the jumper switch is connected to a sixth power supply, a second end of the jumper switch is connected to the processor chip U1, and a second end of the jumper switch is coupled to a reference ground through a resistor.
9. The train bogie real-time sensor smart detection electrical control system as recited in claim 8, wherein the current switching circuit comprises an eight-way Darlington chip U6, pin 1 of the eight-way Darlington chip U6 is connected to pin 38 of a processor chip U1 in the CPU main control circuit, pin 2 of the eight-way Darlington chip U6 is connected to pin 39 of a processor chip U1 in the CPU main control circuit, pin 3 of the eight-way Darlington chip U6 is connected to pin 40 of a processor chip U1 in the CPU main control circuit, pin 4 of the eight-way Darlington chip U6 is connected to pin 41 of a processor chip U1 in the CPU main control circuit, pin 5 of the eight-way Darlington chip U6 is connected to pin 42 of a processor chip U1 in the CPU main control circuit, pin 6 of the eight-way Darlington chip U6 is connected to pin 43 of a processor chip U1 in the CPU main control circuit, pin 8 of the eight-circuit Darlington chip U6 is coupled to a seventh power supply through a resistor RA 7;
a plurality of parallel relay branches are connected between a pin 10 of the eight-path Darlington chip U6 and a pin 11 of the eight-path Darlington chip U6, the relay branch comprises a relay KA1, a diode DA1, a light emitting diode DAL1, a resistor RA1 and a fuse F4, the pin 4 of the relay KA1 is connected to the pin 9 of the relay KA1, the pin 9 of the relay KA1 is connected to the first end of the resistor R77 in the current detection comparison circuit, pin 5 of the relay KA1 and pin 8 of the relay KA1 are connected to a first end of the fuse F4, the second end of the fuse F4 is connected to an electric connector, a series circuit composed of the light emitting diode DAL1 and the resistor RA1 is connected in parallel with the diode DA1 to the pin 1 of the relay KA1 and the pin 12 of the relay KA1, and the pin 1 of the relay KA1 is connected to an eighth power supply.
10. The train bogie real-time sensor intelligent detection electric control system according to claim 9, characterized in that the current switching circuit also comprises a relay KA8, a diode DA8, a light emitting diode DAL8 and a resistor RA8, the pin 4 of the relay KA8 is connected to the pin 9 of the relay KA8, the pin 9 of the relay KA8 is connected to the second end of the resistor R77 in the current detection comparison circuit, pin 5 of the relay KA8 and pin 8 of the relay KA8 are connected to the electrical connector, the series circuit of the light emitting diode DAL8 and the resistor RA8 is connected in parallel with the diode DA8 to the pin 1 of the relay KA8 and the pin 12 of the relay KA8, pin 1 of the relay KA8 is connected to pin 10 of the eight-way darlington chip U6, pin 12 of the relay KA8 is connected to pin 11 of the eight-way darlington chip U6.
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